64439161 has 2 divisors, whose sum is σ = 64439162. Its totient is φ = 64439160.

The previous prime is 64439159. The next prime is 64439191. The reversal of 64439161 is 16193446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41216400 + 23222761 = 6420^2 + 4819^2 .

It is a cyclic number.

It is not a de Polignac number, because 64439161 - 2¹ = 64439159 is a prime.

Together with 64439159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64439191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32219580 + 32219581.

It is an arithmetic number, because the mean of its divisors is an integer number (32219581).

Almost surely, 2^64439161 is an apocalyptic number.

It is an amenable number.

64439161 is a deficient number, since it is larger than the sum of its proper divisors (1).

64439161 is an equidigital number, since it uses as much as digits as its factorization.

64439161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 64439161 is about 8027.4006378155. The cubic root of 64439161 is about 400.9128340006.

The spelling of 64439161 in words is "sixty-four million, four hundred thirty-nine thousand, one hundred sixty-one".